#include <iostream>

using namespace std;

int main()
{
    int n,coun,x;
    cin>>n;
    coun=0;
    do
    {
        x=n%2;
        if(x==1)
            coun++;
        n=n/2;
    }
    while(n>0);
    cout<<coun;
    return 0;
}